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v3.23.1

Summary of Loan Loss Reserve Included in Other Liabilities and Accrued Expenses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Loans Held For Sale |  |  |
Balance, beginning of period |  | $ 2,447,139 | $ 20,583,618
Provision on current loan originations (1) | [1] | 1,078,812 | 2,211,230
Charge-offs, net of recaptured amounts |  | (1,800,284) | (20,347,709)
Balance, end of period |  | $ 1,725,667 | $ 2,447,139
[1] | Included in Mortgage fee income

X
- Definition Represents the monetary amount of Beginning, Loan Loss Reserve, as of the indicated date. + References No definition available. + Details
Name: | SNFCA_BeginningLoanLossReserve
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | SNFCA_DisclosureLoansHeldForSaleAbstract
Namespace Prefix: | SNFCA_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans Held for Sale. + References No definition available. + Details
Name: | SNFCA_EndingLoanLossReserve
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loan loss reserve charge offs. + References No definition available. + Details
Name: | SNFCA_LoanLossReserveChargeOffs
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Provision on current loan originations. + References No definition available. + Details
Name: | SNFCA_LoanLossReserveProvisionsForLoss
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration